Audio amplifier



FIG. 1 is a perspective view of the front, top and right side of an audio amplifier according to a first embodiment showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a perspective view of the front, top and right side of an audio amplifier according to a second embodiment showing my new design;

FIG. 9 is a front view thereof;

FIG. 10 is a rear view thereof;

FIG. 11 is a left side view thereof;

FIG. 12 is a right side view thereof;

FIG. 13 is a top plan view thereof; and,

FIG. 14 is a bottom view thereof.

The broken line showing of the audio amplifier is included for the purpose of illustrating portions of the audio amplifier and forms no part of the claimed design. 

CLAIM The ornamental design for an audio amplifier, as shown and described. 